<template>
  <el-container class="home-container">
    <!--头部区域  组件名称就是类名-->
    <el-header>
       <div>
         <img src="../assets/images/logo.png" alt="">
         <span>商城管理系统</span>
       </div>
       <el-button type="info" @click="logOut">退出</el-button></el-header>
    <!--页面主体区域-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollape">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu background-color="#333744"
          text-color="#fff"
          active-text-color="#409BFF" :unique-opened='true' :collapse="isCollapse" 
          :collapse-transition="false" :router="true" :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{item.authName}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/'+subItem.path)">
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{subItem.authName}}</span>
              </template>
            </el-menu-item>
          </el-submenu>
        </el-menu>
      </el-aside>
      <!--右侧内容-->
      <el-main><router-view></router-view></el-main>
    </el-container>
  </el-container>
</template>
<script>
export default {
  data: function() {
    return {
      // 左侧菜单
      menulist: [],
      iconsObj: {
        '1': 'iconfont icon-user',
        '2': 'iconfont icon-tijikongjian',
        '3': 'iconfont icon-shangpin',
        '4': 'iconfont icon-danju',
        '5': 'iconfont icon-baobiao'
      },
      isCollapse: false,
      // 正在访问的网址
      activePath: ''
    }
  },
  created() {
    this.getMenuList()
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logOut() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取后台左侧的菜单
    async getMenuList() {
      // 暂时没有接口，先模拟数据
      // const { data: result } = await this.$http.get('menus')
      // 模拟数据
      const result = {
        data: [
          {
            authName: '用户管理',
            children: [
              { id: 11, authName: '用户列表', path: 'users', children: [] }
            ],
            id: 1,
            order: 1,
            path: 'users'
          },
          {
            authName: '权限管理',
            children: [
              { id: 12, authName: '角色列表', path: 'role', children: [] },
              { id: 13, authName: '权限列表', path: 'rule', children: [] }
            ],
            id: 2,
            order: 2,
            path: 'rights'
          },
          {
            authName: '商品管理',
            children: [],
            id: 3,
            order: 3,
            path: 'goods'
          },
          {
            authName: '订单管理',
            children: [],
            id: 4,
            order: 4,
            path: 'orders'
          },
          {
            authName: '数据统计',
            children: [],
            id: 5,
            order: 5,
            path: 'reports'
          }
        ],
        msg: 'success',
        status: 200
      }
      // 判断是否获取失败
      if (result.status !== 200) return this.$message.error(result.msg)
      this.menulist = result.data
      console.log(result)
    },
    // 点击展示 或者隐藏左侧菜单
    toggleCollape() {
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath) {
      window.sessionStorage.setItem('activePath', activePath)
      this.activePath = activePath
    }
  }
}
</script>
<style lang="less" scoped>
.home-container {
  height: 100%;
}
// 组件名称就是类名
.el-header {
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;
  > div {
    display: flex;
    align-items: center;
    span {
      margin-left: 15px;
    }
  }
}
.el-aside {
  background-color: #333744;
  .el-menu {
    border: 0px;
  }
}
.el-main {
  background-color: #eaedf1;
}
.iconfont {
  margin-right: 10px;
}
.toggle-button {
  background-color: #4a5064;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  //增加或减少字符间的空白
  letter-spacing: 0.2em;
}
</style>
